[MonoDevelop] Proposed patch for bug 336368

[Marcos Marín]

The attached patch fixes bug 336368[1]. It moves all the threading from
ProjectNodeBuilderExtension to TagDatabaseManager, the UpdateFileTags now
only enqueues the file and a thread running in the background constantly
checks the queue for new jobs every second.

Would appreciate some feedback and whether it is ok for me to commit and
mark the bug as resolved.

[1]https://bugzilla.novell.com/show_bug.cgi?id=336368
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